Malicious PDF — malware analysis report

Static analysis result for SHA-256 49586ebec1f22e8d…

MALICIOUS

PDF

99.8 KB Created: 2021-06-09 01:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 44523eec36ae68e482f3754a6e5ee010 SHA-1: 584f8aa8bea4e9e4621600819314ecf7efb91fc7 SHA-256: 49586ebec1f22e8d19ce7530bcc1932748a60d7a3d93c365d6994c1a4978e553
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts to trick the user into installing a fake browser extension or update. The embedded URLs and link farm heuristics further support this, pointing to various compromised or disposable hosting sites, likely serving as download locations for malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+english+subtitle+download PDF link annotation
    • http://brmxn.com/userfiles/file/20210522180600_2zpry7.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hd0o7h5pcqpq77lnjm8sbfdje4/31201029273.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d33de9056---60610337805.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7c51ad895204fd6d4d0a52fd0a4071a/rinop.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa0675202---lonadigubigiwisanugefuni.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/salewekupupixu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8bae6f4e1a974640c9785821f8813aab/bajezik.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/va68bbkfm71nq0rhdk685mheh6/kufaximazodumedumivam.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zitadokijajezal.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/duten.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601ed081bd---durenajemomapigewixete.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb8b7aff6---zivatabafanirubivasu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/521102d1c44a62f2ce80af2f76d97fd3/tukomoluruxolaveja.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753dad5b02d---82394707390.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050906430273499.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/17420847092.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/worudes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 6444 bytes
SHA-256: 2339ca748967b138c9b29779ff8fab5aa32da7d1f3836e8287943f265d569086
font_01_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 5560 bytes
SHA-256: 47c5872297277feee57d40902da8a72cec6d4f48dd0f308f8a536fc46b1b7c23
font_02_sfnt_off00012819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12819 5712 bytes
SHA-256: d65ebf9b5d06b2cd41fcc2ed16319d74387ad08c590b05644e59a1eda9cb5211
font_03_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 11744 bytes
SHA-256: a185b2cc10fc312e03d4f85df8e5e1aec113e2bbdf6589b00c013a589d3b3a42
font_04_sfnt_off000162e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E1 18620 bytes
SHA-256: 218170dd2b76b49424c9df111f5abfdd510a7392e72574a8659ca17f060ebfa7

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